Celine, not to be too picky but it is "devions" rather than "devrions" isn't it?
Freeform Writing Exercise A2
and the imparfait is correct.
Take a look at the following Kwiziq lesson on how to use 'devoir à l'imparfait' :
When to use "devoir" in L'Imparfait or Le Passé Composé
Hope this helps!
Not quite sure just what it is that you are asking, but devions will be imparfait and devrions conditionnel.
Hope this helps?
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